By Skip Fazzari, Authentication Consultant to NGC

Fingerprints are like a cancer to a coin, and can become irreparable if they are ignored for too long. Skip Fazzari describes the different types of fingerprints and what you can do to correct them.

For most of you, habit and experience have lessened the odds of marring the surface of your coins with fingerprints. You hold a coin properly — by its edges and close to a soft surface. Occasionally, there might be a lapse in this protocol but in most cases, we can assume that any fingerprints found on your coins resulted from carelessness or mishandling by non-collectors.
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It is difficult to know how long a fingerprint has been on a coin. Sometimes, especially in the case of Proof coins, they are easy to see the moment they occur; however, in most cases, fingerprints are not detected when they are fresh. Fingerprints are like a cancer to a coin. If ignored for too long, the chemicals in our body oils will actually etch the coinage metal. Over a period of time, and depending on their chemical makeup and the environment, they will “set” on a coin’s surface, making them difficult to remove. Copper and silver coins are the most likely to be permanently damaged in this way. Once this happens, the traces of fingerprints are virtually impossible to remove without abrasive cleaning that ruins more of the coin’s original surface. For the most part, gold is not susceptible to any type of permanent damage from fingerprints; however, on a few occasions, I have encountered a print pattern on gold that cannot be removed.  Read Full Article